Internal-combustion engine.



Y A. l. SANDBO.

INTERNAL COMBUSTION ENGINE.

APPLICATION FILED APR. 16, 1914.

Patented June 22, 1915.

2 SHEETS-SHEET 1.'

[N VEN T 01? A. SANDBO.

INTERNAL COMBUSTION ENGINE.

APPLICATION FILED APR. 16' 1914.

Oji

Patented June 22, 1915.

2 SHEETSSHEET 2.

INVENZOR v the cylinders, said water passes out of an outlet port 52 and is carried olf through any suitable pipes, (not shown).

Each of the cylinders comprises an inner head 53, there being provided therein a suitable packing as at 54: held in place by a threaded sleeve 55, said head 53 being secured to the inner end 56 of the cylinder by bolts 57, said inner end also being secured by bolts 19 to the frame 18 as before described.

The outer head 58 of each cylinder is partly cylindrical and is secured to the main body of the cylinder by bolts 59, said outer end forming the explosion chamber 60 into which opens a valve 61, self-closed outwardly, by a spring 62 coiled around the valve stem 63 and secured thereto at 64 havlng its inward bearing against a spider 65 i the yalve casing 66, through which spider the valve stem may reciprocate in opening and closing.

The valve casing 66 projects downwardly from the cylinder, into the primary gas chamber 67, its lower end in said chamber being open, and said chamber extending horizontally, the length of the cylinder and being provided with a port 68 at its inner end, opening into the inner end of the cylinder. Projecting outwardly from the inner end of the primary gas chamber 67 is another valve casing 69 in which operates a valve 76 self-closed outwardly by a spring 71, the valve casing 69 communicating with one end-72 of a manifold 73 which at its center communicates with a carbureter 74 of anv approved construction, the opposite end of the manifold, as at 75 in Fig. 4, communicating with the cvlinder 11.

At a point within the cylinders, as at 76.

in Figs. 1 and 6. a series of exhaust openings or ports 76 are provided. extending entirely around the cylinder and all communieating with a manifold 77 extending ,entirely around the cvlinder, its open upper ends forming an exhaust port to the outer air as at 78, Fig. 7. These ports 76 are so located as to be closed by the pistons and to be opened when said pistons have nearly reached the ends of their inward strokes.

The pistons {are provided with suitable packing rings 79 and the inner ends of the pistons arev r'g'lindn-il. and the piston rod. at its'o itez 5 (z-us, being suitably secured therein,

rasscsmto solid portions of times in the rotation of the shaft, the timer being held against rotation in the usual manner, and the circuit being closed to make a spark to cause an explosion in one of the explosion chambers each time contact between the roller and contact point occurs.

Any approved batteries and. circuit may be employed, it being deemed unnecessary to illustrate an example herein.

From the foregoing it will be apparent that all of the objects of the invention are carried out in the described construction.

The construction" is strong, simple and economical. When the pistons are moved to the right, the gas inthe right hand'end of the right hand cylinderforms a cushion at the enl of the stroke and vice versa, when the pistons are moved to the left, the gas in the left hand end of the left hand cylinder forms a cushion at ,theend of that stroke.-

All of the parts needing adjustment from time to time are so constructed and located that they are readily accessible from the outside, thus avoiding the necessity of crawling.

under or climbing over parts during such adjustments.

The exhaust ports extend evenly and around the cylinders thereby keeping them in proper alinement for the work, and the provision of an inlet well in each cylinder head avoids the waste of gases usual in twocycle engines.

The primary gas chambers are formed ilk tegral with the cylinders whereby the heat of the cylinders is communicated to the gases, thereby assuring more perfect com-' bustion.

I have described the construction, arrangement and combination of the several parts comprised in my invention very specifically but I wish it to be understood that I do not confine my invention thereto, as many slight changes and variations might suggest themselves to the skilled mechanic within the spirit and scope of my invention as hereinafter claimed.

Having thus fully described my. invention what I claim as new and desire to secure by Tietters Patent of the United States,

1. An internal combustion engine comprising apair of alined cylinders, aframe between said cylinders to which they are secured, adjustable angle ironguideplates or in-eases said frame, a cross head slidably mounted between said guide plates, a piston rod centrally connected to said cross head and extending into each cylinder, and a piston head in each cylinder connected to the contiguous end of the piston rod.

2. An internal combustion engine comprising a pair of alined cylinders, a frame between said cylinders to which they are secured, adjustable angle iron guide plates on said frame, a cross head slidably mounted between said guide platesy'a piston rod centrally connected to said cross head and tending into each cylinder and a piston head in each cylinder connected to theoontiguous end of the piston rod, said frame being of skeleton formation and the piston rod being provided with compressible packing and with compressing means accessible through openings in said skeleton frame.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

Jones BERG; VIM" A. SHINE. 

